OBS Crius Plus RTA is made of 304 Stainless Steel and Silica glass. Delrin drip tip makes it more endurable and environment friendly advantages. The side filling system makes refill more easier and faster. Full glass window can show the e-juice level very clearly. The top and bottom has airflow control rings. The Crius Plus RTA comes with 2 different deck: classic velocity style and innovative quad coil design. By adjusting the juice flow in order to use 100%PG to 100%VG liquid.